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Question 4: NCERT Class 12th Physics: Chapter 1 – Electric Charges And Fields
(a) Explain the meaning of the statement ‘electric charge of a body is quantised’.
(b) Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?
Solution:
(a) The net charge possessed by a body is an integral multiple of charge of an electron i.e. q = ± ne, where n = 0,1,2,3,… is the number of electrons lost gained by the body and e = 1.6 × 10-19 C is charge of an electron. This is called law of quantization of charge.
(b) At macroscopic level, charges are enormously large as compared to the charge of an electron, e = 1.6 × 10-19 C. Even a charge of 1 nC contains nearly 1013 electronic charges. So, at this large scale, charge can have a continuous value rather than discrete integral multiple of e, and hence, the quantization of electric charge can be ignored.
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 1-Electric Charges And Fields